code: def testEmpty(self):
      self.assertEqualVector(AutoCorrelation()([]), [])
  
file_path: essentia/test/src/unittests/stats/test_autocorrelation.py
imports: from essentia_test import *
label_desc: Use image node_id 5 for calling the TestAutoCorrelation obj's underlying member method code with example usage: obj.testEmpty() without return types